/// Answer-first planning notes
What stone volume do my separate project areas require?
| Planning input | Calculation role | Check before ordering |
|---|---|---|
| Separate areas | Sum each shape's volume | Keep different depths auditable |
| Selected density | Provides an optional short-ton estimate | Do not reuse another stone product's density |
| Adjusted cubic yards | Supports bulk-order discussion | Check supplier increments and access |
Optional stone weight is expressed in U.S. short tons, defined here as 2,000 pounds, after applying the entered density.
Evidence: National Institute of Standards and Technology/// Formula & field notes
How this stone estimate works
FormulaTotal volume is the sum of each area. Estimated tons = waste-adjusted cubic feet × selected density ÷ 2,000.
Worked example
Two 12 ft × 4 ft beds at 3 in deep total 24 ft³, or 0.89 yd³ before waste. Stone type determines the final tonnage.
/// Source trail
Data & assumptions
Every source has a declared scope. A reference can support a conversion or product assumption without turning this estimate into a supplier quote.
Exact international-foot to meter conversion; U.S. survey-foot conversion is explicitly outside this claim.
Effective 2025-08-18 · Reviewed 2026-07-15 · Next review 2027-07-15Independent confirmation that one international foot equals exactly 0.3048 meters; U.S. survey-foot conversion remains distinct.
Effective 2025-06-10 · Reviewed 2026-07-15 · Next review 2027-07-15Exact international avoirdupois-pound conversion; troy and apothecaries pounds are excluded.
Effective 2026-01-06 · Reviewed 2026-07-15 · Next review 2027-07-15Independent statutory confirmation of the exact international avoirdupois-pound definition.
Effective 1985-10-30 · Reviewed 2026-07-15 · Next review 2027-07-15Exact U.S. short-ton definition; long ton and metric tonne are excluded.
Effective 2026-01-06 · Reviewed 2026-07-15 · Next review 2027-07-15Independent statutory confirmation that the U.S. short ton is 2,000 avoirdupois pounds.
Effective 2026-04-17 · Reviewed 2026-07-15 · Next review 2027-07-15/// Common questions
Stone calculator FAQ
How much extra stone should I order?
Use a project-specific allowance for irregular excavation, compaction, spillage, cuts, and supplier minimums. ProjectQty starts at zero instead of guessing; enter the allowance your plan or supplier supports, then confirm the final tons or cubic yards.
Is the result a supplier quote?
No. ProjectQty calculates quantities from your dimensions and assumptions. Prices are optional user inputs, not live local quotes, and delivery, taxes, minimum loads, and labor are not included unless you add them separately.
Can I use metric measurements?
Yes. Switch to Metric before entering measurements. ProjectQty normalizes the geometry internally and shows the most useful ordering units for the selected material.